The first half of season one is already out in R2 UK. The second half will probably be released in late July (see Amazon.co.uk).
I'm waiting for the eventual R1 releases.
Sorry David, but just because R2 has it doesn't mean we'll see it anytime soon in R1. Since West Wing is a popular show they'll probably have to wait until it has enough episodes to be sold to syndication, then wait until the episodes have aired before we'll see a DVD release.